<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .flex{
            display: flex;
            flex-direction: row-reverse;
            justify-content:flex-end;
        }
        .row-1{
            width: 200px;
            height: 200px;
            background-color: #1b88ee;
            /*order: 2;*/

        }

        .row-2{
            width: 200px;
            height: 200px;
            background-color: pink;
            /*order: 1;*/

        }

        .row-3{
            width: 200px;
            height: 200px;
            background-color: red;
            /*order: 0;*/

        }
    </style>
</head>
<body>
<div class="flex">
    <div class="row-1">1</div>
    <div class="row-2">2</div>
    <div class="row-3">3</div>
</div>

<div class="dom">
<div class="item">

</div>
</div>
</body>
</html>